variable assignment in "while" loop

Bengt Richter bokr at oz.net
Tue Jul 29 21:22:50 CEST 2003


On 29 Jul 2003 12:08:50 GMT, Sybren Stuvel <sybrenUSE at YOURthirdtower.imagination.com> wrote:

>Hi there,
>
>Is it possible to use an assignment in a while-loop? I'd like to do
>something like "loop while there is still something to be read, and if
>there is, put it in this variable". I've been a C programmer since I
>was 14, so a construct like:
>
>while info = mydbcursor.fetchone():
>	print "Information: "+str(info)
>
>comes to mind. Unfortunately, this doesn't work. Is there a similar
>construct in python?
>
I thought of a little variation on the list comprehension hack that is usually advised against:

    while [info for info in [mydbcursor.fetchone()] if info]:
        print "Information: %s" % info

I sort of like the mnemonic of the if info that makes the while
see [] at the end rather than e.g. [None][0]

Regards,
Bengt Richter




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